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This page is devoted to frequently asked questions (FAQ) related to [|kb:Solid]. {info} \\ {on-this-page} h2. Are solid objects with less than eight nodes available? *Answer:* Yes, degenerate [solids|kb:Solid] are available, which are solid objects with collapsed (duplicated) nodes. These solids have less than eight nodes, and are useful for [modeling|kb:Modeling techniques] wedges and tetrahedra. [Joints|kb:Joint] may be collapsed in a variety of ways. An error message will report any creation of an illegal solid object. {hidden-content} *Related Email:* * {email:date=1/20/2011|from=rs|to=ok|subject=Degenerated solid elements|comment=Degenerated solid elements are supported in SAP2000|id=6357854} *Related Incident:* * {incident:no=31566|comment=Document degenerated solid elements} {hidden-content} h2. How are solid objects drawn in SAP2000? *Answer:* [Solid|kb:Solid] objects may be created in SAP2000 through one of the following two methods: # Extrude [area|kb:Shell] objects by using Edit > Extrude. \\ \\ # Define solid objects directly by using [interactive database editing|kb:Interactive database editing] to modify the Connectivity - Solid table, available through Edit > Interactive Database Editing > Model Definition > Connectivity Data > Object Connectivity > Table: Connectivity - Solid. {hidden-content} *Related Incident:* * {incident:no=34404|comment=Incompatible modes for solid elements} \\ ** {email:date=4/28/2011|from=ok|to=tfg|subject=Incompatible modes for solid elements|comment=|id=7635440} {hidden-content} h2. Why are red springs automatically generated on my solid objects? *Answer:* Red springs are typically generated for solid objects with edge [constraints|kb:Constraint] to restrain their [joints|kb:Joint] from rotation. Solid objects activate only three translational degrees of freedom (DOF) at each joint location. Edge-constraint implementation then activates the three rotational DOF. Since solid objects do not provide rotational stiffness, internal rotational springs are generated at affected joints to provide rotational stiffness such that local [numerical instabilities|kb:Numerical problems] do not occur. Without these internal rotational springs, warning messages in the output log would report zero stiffness at affected DOF. These warnings may either be ignored or eliminated by providing rotational springs. {hidden-content} *Related Incidents:* * {incident:no=36428|comment=Red springs for joints of solid elements.} \\ * {incident:no=42797|comment=Edge constraints for solid elements.} {hidden-content}. |
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Are solid objects with less than eight nodes available?
Answer: Yes, degenerate solids are available, which are solid objects with collapsed (duplicated) nodes. These solids have less than eight nodes, and are useful for modeling wedges and tetrahedra. Joints may be collapsed in a variety of ways. An error message will report any creation of an illegal solid object.
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Related Emails and Incidents:
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How are solid objects drawn in SAP2000?
Answer: Solid objects may be created in SAP2000 through one of the following two methods:
- Extrude area objects by using Edit > Extrude.
- Define solid objects directly by using interactive database editing to modify the Connectivity - Solid table, available through Edit > Interactive Database Editing > Model Definition > Connectivity Data > Object Connectivity > Table: Connectivity - Solid.
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Why are red springs automatically generated on my solid objects?
Answer: Red springs are typically generated for solid objects with edge constraints to restrain their joints from rotation.
See the Solid elements and rotational degrees of freedom at their joints article for additional information on why the joints need to be restrained from rotation.
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